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X=8+2y
(8+2y)²+2y²-22=0
64+32y+4y²+2y²-22=0
6y²+32y+42=0
3y²+16y+21=0
D=256-252=4
y1=(-16-2)/6=-3⇒x1=8-6=2
y2=(-16+2)/6=-7/3⇒x2=8-14/3=10/3
(2;-3);(10/3;-7/3)
Log0,3(X)+log0,3(5)=log0,3(55)
log0,3(5X)=log0,3(55)
5X=55
X=11
Проверка:
log0,3(11)+log0,5(5)=log0,3(55)
log0,3(55)=log0,3(55)
55=55
Решаем способом сложения. Ответ (-2;5)
Y = - 3x^2 - 5x - 2
y = 0
- 3x^2 - 5x - 2 = 0
D = 25 - 24 = 1 ; V D = 1
X1 = ( 5 + 1 ) : ( - 6 ) = - 1
X2 = ( 5 - 1 ) : ( - 6 ) = - 2/3
x = 0
y = - 2
Ответ ( 0 ; - 2 ) ; ( - 1 ; 0 ) ; ( - 2/3 ; 0 )